Nicknamed “The World of Fire and Ice”, Frovula, with a far-out orbit, should be frozen solid. But it’s not. Because of its large moon, Frovula’s crust is regularly stretched and kneaded. This causes it to be a molten, volcanic planet, despite being so far from its dim red sun.
No life — too cold for liquid waterExtreme Activity
Why is this a Volcanic World?Runaway tidal heating from its moons drives volcanism across a cold crust - the planet is kneaded like Io.
Resonant, close-in moons pump orbital eccentricity, and the resulting tidal flexing dissipates enormous heat in the interior. Only a fraction of the surface is molten at once, so the ground between the vents stays as cold as the orbit allows - Io's own equilibrium temperature is about 110 K.
Classification Criteria:
✓ Close-in moons in a resonant configuration✓ Tidal heat flux beyond the runaway threshold- The orbit is not what melted it: 4.00 AU, 64K equilibrium
Habitability ScoreUninhabitable
0
Contributing Factors
water22
Abundant water - frozen solid, no liquid phase at this temperature
geology40
Extreme volcanic activity may be hazardous
rotation10
Near tidally locked - one hemisphere perpetually scorched, other frozen, narrow habitable twilight zone only
Organic Chemistry80
Core organic elements (CHNO) present
atmosphere16
Atmosphere present but composition not ideal for life (partially stripped by slow rotation)
temperature0
Frozen world - minimal potential for complex life (large moon stabilizes the axial tilt - steady seasons) (runaway tidal heating keeps the surface molten regardless of orbit)
magnetic Field35
No magnetic field - vulnerable to solar radiation (a large close moon may help stir the core dynamo (speculative))
Physical Properties
Mass
0.10x Earth (5.97e+23 kg)
Radius
0.46x Earth (2,957 km)
Surface Gravity
0.46x Earth (4.6 m/s²)
Surface Temperature
64 K (-209 °C / -345 °F)
Rotation Period
26.0 hours/day (slower than Earth)
Orbital Environment
Star Type
M-type (Red Dwarf)
Distance from Star
4.00 AU (598 million km)
Orbital Period
14.6 years
Atmosphere
Volcanic outgassing - sulfur compounds and vaporized rock
Elemental Composition
O - Oxygen
34.5%
H - Hydrogen
17.2%
Si - Silicon
17.2%
Surface Characteristics
Runaway tidal heating drives volcanism across a cold crust - lava lakes and sulfur plains between frozen plains
Outside the synchronous orbit: slowly receding, like Luna (~cm per year).
Tidal braking locked the planet to its moon: one face forever moonward.
+5 temperature: large moon stabilizes the axial tilt - steady seasons-85 temperature: runaway tidal heating keeps the surface molten regardless of orbit+5 magneticField: a large close moon may help stir the core dynamo (speculative)